Quantum Computing
Quantum Computing news — Monday 09 November 2026
124 stories from 3 sources, every one in English. Each links to its publisher.
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Physics Reports Analysis Evaluates Emergence of Hybrid Semiconductor–Superconducting Qubit Architectures
Quantum Computing Report
A new review in Physics Reports examines hybrid semiconductor-superconductor qubits, highlighting their development and various architectures like gate-tunable transmons and fluxoniums, Andreev level qubits, and Majorana-based parity…
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DLR Develops Scalable Unitary Data Encoding Beating Exponential State-Preparation Depth
Quantum Computing Report
Researchers at the German Aerospace Center (DLR) and the University of Cologne developed a new quantum state-preparation framework that significantly reduces circuit depth for loading classical data onto quantum computers. Their method…
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IonQ and Classiq Outline Architectural Trade-Offs in Fault-Tolerant Resource Estimation
Quantum Computing Report
IonQ and Classiq's analysis shows that minimizing non-Clifford gates is no longer the primary factor in fault-tolerant quantum computing performance. Advances in magic state preparation mean that routing, Clifford gates, and memory…
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Horizon Quantum Integrates Triple Alpha IDE with OQC’s Toshiko Processor for Pulse-Level Control
Quantum Computing Report
Horizon Quantum Computing and Oxford Quantum Circuits have integrated Horizon's Triple Alpha IDE with OQC's 32-qubit Toshiko processor. This integration allows for pulse-level control, enabling users to execute pulse scheduling, qubit…
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Q-Block Computing Establishes Ottawa Headquarters to Expand Quantum Hardware R＆D
Quantum Computing Report
Q-Block Computing, a Canadian quantum systems developer, has established its corporate headquarters in Ottawa to centralize R&D, engineering, and administration. The company develops hardware for precision timing, secure photonic…
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Busan Science Museum Opens Quantum Education Exhibition with KRISS
The Quantum Insider
Insider Brief The National Science Museum in Busan has partnered with the Korea Research Institute of Standards and Science (KRISS) to launch a public education programme introducing visitors to quantum science through its Quantum Magic…
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IBM Deploys First Quantum Computer in Illinois with Quantum System Two
The Quantum Insider
Insider Brief IBM, the University of Chicago , the State of Illinois and the Illinois Quantum and Microelectronics Park have unveiled an IBM Quantum System Two in Chicago, marking the company’s first quantum computer deployment in…
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IBM Patent Application Targets More Efficient Sharing of Quantum Computers
The Quantum Insider
Insider Brief An IBM patent application describes a way to run multiple users’ quantum jobs together while reducing the work required for error mitigation. The proposed scheduler would group compatible circuits and reuse stored noise…
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Classical Stochasticity Using Quantum Computers
arXiv quant-ph
arXiv:2606.09384v2 Announce Type: replace Abstract: We demonstrate that quantum algorithms can be used to model classical stochastic simulations as the measurement process is inherently random. To illustrate, we solve the classical Lorenz…
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Sub-shot-noise emission statistics of a CW-excited single photon source
arXiv quant-ph
arXiv:2605.12397v2 Announce Type: replace Abstract: Shot noise sets a fundamental limit on the sensitivity of classical optical measurements, with coherent emitters achieving the lowest possible shot-noise level. Emission from…
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Low-rank geometry of two-qubit gates
arXiv quant-ph
arXiv:2604.15102v2 Announce Type: replace Abstract: We present a framework based on the determinantal geometry of two-qubit gates. Combining the Weyl chamber representation with operator Schmidt theory, we interpret gate synthesis as a…
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Quantitative Universal Approximation for Noisy Quantum Neural Networks
arXiv quant-ph
arXiv:2604.02064v4 Announce Type: replace Abstract: We prove a quantitative universal approximation theorem for noisy quantum neural networks (QNNs), with explicit non-asymptotic error bounds in terms of the number of accuracy blocks, the…
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Operational impact of quantum resources in chemical dynamics
arXiv quant-ph
arXiv:2603.06833v2 Announce Type: replace Abstract: Quantum coherence and other non-classical features are widely discussed in chemical dynamics, yet it remains difficult to quantify when such resources are operationally relevant for a…
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Enhancing Long-distance Continuous-variable Quantum-key-distribution with an Error-correcting Relay
arXiv quant-ph
arXiv:2512.11224v2 Announce Type: replace Abstract: Noiseless linear amplifiers (NLAs) serve as an effective means to enable long-distance continuous-variable (CV) quantum key distribution (QKD), even under realistic conditions with…
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Simulating Gaussian boson sampling on graphs in polynomial time
arXiv quant-ph
arXiv:2511.16558v3 Announce Type: replace Abstract: We show that a distribution related to Gaussian Boson Sampling (GBS) on graphs can be sampled classically in polynomial time. Graphical applications of GBS typically sample from this…
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Fully quantum algorithmic framework for partial differential equation-constrained optimization
arXiv quant-ph
arXiv:2511.14420v3 Announce Type: replace Abstract: Partial differential equation (PDE)-constrained optimization, where an optimization problem is subject to PDE constraints, arises in various applications such as design, control, and…
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Quantum Simulation of Non-Hermitian Special Functions and Dynamics via Contour-based Matrix Decomposition
arXiv quant-ph
arXiv:2511.10267v4 Announce Type: replace Abstract: Simulating non-Hermitian dynamics on quantum computers is often hindered by the decay of success probability and the instability of non-diagonalizable matrices. Here, we present…
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Quantum algorithms to detect ODMR-active defects for quantum sensing applications
arXiv quant-ph
arXiv:2508.13281v3 Announce Type: replace Abstract: Spin defects in two-dimensional materials are a promising platform for quantum sensing. Simulating the defect's optical response and optically detected magnetic resonance (ODMR) contrast…
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Imprints of information scrambling on eigenstates of a quantum chaotic system
arXiv quant-ph
arXiv:2507.02853v2 Announce Type: replace Abstract: How are the spatial and temporal patterns of information scrambling in locally interacting quantum many-body systems imprinted on the eigenstates of the system's time-evolution operator?…
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Statistics of Strongly Coupled Defects in Superconducting Qubits
arXiv quant-ph
arXiv:2506.00193v2 Announce Type: replace Abstract: Decoherence in superconducting qubits is dominated by defects that reside at amorphous interfaces. Interaction with discrete defects results in dropouts that complicate qubit operation…
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Quantum-to-classical transition and the emergence of trajectory level Darwinism with measurements distributed in time: a path integral approach
arXiv quant-ph
arXiv:2505.16889v3 Announce Type: replace Abstract: We present a formulation for the emergence of classical dynamics in a quantum world using a path integral approach that incorporates continuous measurements. It complements decoherence…
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Concentration of ergotropy in quantum many-body systems
arXiv quant-ph
arXiv:2412.19801v2 Announce Type: replace Abstract: Ergotropy$\unicode{x2014}$the maximal amount of unitarily extractable work$\unicode{x2014}$quantifies the "charge level" of a quantum battery. We prove that, in large many-body batteries…
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Learning State Preparation Circuits for Quantum Phases of Matter
arXiv quant-ph
arXiv:2410.23544v3 Announce Type: replace Abstract: Many-body ground state preparation is an important subroutine used in the simulation of physical systems. In this paper, we introduce a flexible and efficient framework for obtaining a…
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Limit cycles in periodically driven open quantum systems
arXiv quant-ph
arXiv:1908.03900v2 Announce Type: replace Abstract: We investigate the long-time behavior of quantum N-level systems that are coupled to a Markovian environment and subject to periodic driving. As our main result, we obtain a general…
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A Quantum Mechanical Description of Active Matter
arXiv quant-ph
arXiv:2611.09861v1 Announce Type: cross Abstract: The natural environments habitable to life are inseparable from dissipative and entropic forces, which mandate active matter to operate on constant fluxes of energy and momentum to survive…
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Raman anyon-Hubbard model in a 1D Bose lattice gas
arXiv quant-ph
arXiv:2611.09855v1 Announce Type: cross Abstract: The anyon-Hubbard model is the paradigmatic lattice model of one-dimensional (1D) anyons, in which chiral interactions make bosons equivalent to particles with fractional statistics. Its…
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A proof of the Aaronson-Ambainis conjecture
arXiv quant-ph
arXiv:2611.09773v1 Announce Type: cross Abstract: Aaronson and Ambainis conjectured that every bounded polynomial of low degree on the discrete cube has an influential variable. They showed that the conjecture implies that the acceptance…
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Spin to Orbital Angular Momentum Conversion in the Neutron Nucleus Weak Interaction
arXiv quant-ph
arXiv:2611.09677v1 Announce Type: cross Abstract: The neutron nucleus weak interaction generates a small parity non conserving rotation of the neutron spin as the neutron moves through matter. This parity-odd neutron rotary power can reach…
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Local Correlations Determine the Dephasing Threshold of $\mathbb{Z}_2$ Topology
arXiv quant-ph
arXiv:2611.09668v1 Announce Type: cross Abstract: In this work, we try to understand the question of how to address the survival of band topology in the presence of dephasing. We investigate this question in the Kane-Mele $\mathbb{Z}_2$…
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Motion-Induced Polaron Resonance beyond the Orthogonality Catastrophe
arXiv quant-ph
arXiv:2611.09390v1 Announce Type: cross Abstract: We investigate the spectroscopic response of a repulsively interacting, infinitely heavy impurity moving at constant velocity $v$ through a one-dimensional ideal Fermi gas. Using an exact…
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Spiral momentum spectra and spin asymmetry in vacuum pair production driven by phase-modulated elliptically polarized electric fields
arXiv quant-ph
arXiv:2611.08899v1 Announce Type: cross Abstract: We study vacuum electron--positron pair production in phase-modulated elliptically polarized electric fields using the quantum kinetic equations. We analyze how the modulation amplitude…
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Features of Non-Local Quantum Correlations in Nuclei
arXiv quant-ph
arXiv:2611.08776v1 Announce Type: cross Abstract: Classical simulation of quantum many-body systems is challenged by the combined effects of entanglement and non-stabilizerness (magic). Non-local magic, $M^{\mathrm{NL}}_\alpha$, quantifies…
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Entanglement in Collective Neutrino Oscillations on a Quantum Computer
arXiv quant-ph
arXiv:2611.08595v1 Announce Type: cross Abstract: Simulations on a quantum computer have been propounded as a next-generation tool for studying neutrino flavour oscillations in dense environments like supernovae or neutron star mergers…
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Density kernel and temporal quantum information probes in double-scaled SYK
arXiv quant-ph
arXiv:2611.08592v1 Announce Type: cross Abstract: Entanglement is conventionally defined through a Hilbert space bipartition on a fixed time slice. Recent work has generalized this notion to multiple times through a non-Hermitian density…
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Novikov-Magnus Master Equation for Driven Quantum Systems under Classical Correlated Noise
arXiv quant-ph
arXiv:2611.09876v1 Announce Type: new Abstract: We introduce a modular framework for deriving time-local quantum master equations for driven systems subject to temporally correlated classical noise. The construction combines the…
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Deterministic Quantum Search for NP Problems Through Verifier-Based Oracle Construction
arXiv quant-ph
arXiv:2611.09830v1 Announce Type: new Abstract: Problems in the class NP are important in computational science, where a given candidate solution can be verified in polynomial time, while finding a solution may require evaluating the…
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Arrival-time problem in the quantum information era - observation of a Zeno crossover in monitored arrival-time distributions
arXiv quant-ph
arXiv:2611.09814v1 Announce Type: new Abstract: When does a quantum particle arrive at a detector? The temporal distributions of itinerant quantum particles have been debated since the birth of quantum mechanics. Here we study the…
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Beyond the $n/2$ Threshold: Quantum Query Complexity for Computing Hamming Weight and Symmetric Functions
arXiv quant-ph
arXiv:2611.09809v1 Announce Type: new Abstract: The oracle-interrogation algorithm [van Dam, FOCS '98] computes every $n$-bit Boolean function with bounded error using $n/2+O(\sqrt n)$ quantum queries. In contrast, parity can be computed…
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Differentiable Digital Twins for Optimization, Calibration, and Characterization of Neutral-Atom- and Ion-based Quantum Computers
arXiv quant-ph
arXiv:2611.09779v1 Announce Type: new Abstract: Quantum technologies based on individually controlled atoms are among the most promising platforms for scalable quantum computing, owing to their favorable coherence properties and…
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Scalable Unitary State-Encoding for Generic Large Data
arXiv quant-ph
arXiv:2611.09760v1 Announce Type: new Abstract: Efficient encoding of data into quantum states remains a fundamental bottleneck in many quantum computing protocols, which would otherwise offer advantages over their classical counterparts…
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Witnessing Polarization Entanglement of Annihilation Photons via Compton Scattering
arXiv quant-ph
arXiv:2611.09738v1 Announce Type: new Abstract: Experimentally certifying polarization entanglement in annihilation photons is challenging because polarizers are unavailable in the high-energy regime and one needs to rely on Compton…
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Shaping Frequency-Bin Biphoton Correlations via Programmable Optical Frequency Combs
arXiv quant-ph
arXiv:2611.09713v1 Announce Type: new Abstract: Programmable shaping of photon-pair spectral correlations is important for frequency-bin quantum information processing. However, achieving this control remains challenging in nonlinear…
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An Adaptive Quantum Search Framework under Unknown Solution-density: Minimizing Expected Queries to the First Solution
arXiv quant-ph
arXiv:2611.09688v1 Announce Type: new Abstract: Grover's algorithm provides a mathematically optimal quadratic speedup for unstructured search, yet its standard formulation relies on a critical prerequisite: prior knowledge of the target…
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Quantum Integration Software Suite For HPC-Quantum Computing Workflows
arXiv quant-ph
arXiv:2611.09659v1 Announce Type: new Abstract: In this work, we focus on addressing challenges related to modelling the integration of conventional high-performance computing (HPC) and quantum computing (QC). We introduce the Quantum…
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Slices for normal forms in quantum information and a Riccati-type equation
arXiv quant-ph
arXiv:2611.09645v1 Announce Type: new Abstract: It is known that the normal space to an orbit of a compact group linear action meets each orbit. We show that this yields known normal forms for quantum states. We compute the gradient flow…
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Efficient One-Shot Simulation of Network Instruments and Multi-party Purity Distillation
arXiv quant-ph
arXiv:2611.09641v1 Announce Type: new Abstract: We undertake an information theoretic study of instrument compression problems (ICPs) in {multiple network} configurations, wherein the goal is to design and analyze protocols that simulate…
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Quantum subsets discrimination and key sifting with success probability one
arXiv quant-ph
arXiv:2611.09604v1 Announce Type: new Abstract: Non-distinguishability of non-orthogonal quantum states is the essential feature of quantum mechanics. In particular, one cannot deterministically orthogonalize the set of quantum states…
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BQP-Complete Susceptibilities Observable at Ballistic Times in Local Quantum Dynamics
arXiv quant-ph
arXiv:2611.09563v1 Announce Type: new Abstract: Local response measurements track how perturbations spread in quantum simulators and nonequilibrium many-body systems. Locality bounds constrain the propagation speed, but do not determine…
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Relativistic analogue of the Kramers-Henneberger transformation and pair creation
arXiv quant-ph
arXiv:2611.09549v1 Announce Type: new Abstract: In analogy to the Kramers-Henneberger transformation in non-relativistic quantum mechanics, we propose and investigate a spinor transformation for the Dirac equation which allows us to…
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Open Quantum Time Crystals without External Thermodynamic Resources: Go and No-Go Theorems
arXiv quant-ph
arXiv:2611.09540v1 Announce Type: new Abstract: Time crystals are phases of matter that spontaneously break time-translation symmetry. They have been ruled out in the ground and Gibbs states of isolated systems with only short-range…
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Twisted Compactification, Quotient Quantum Codes and Logical Gates
arXiv quant-ph
arXiv:2611.09538v1 Announce Type: new Abstract: Many quantum codes, including balanced-product, bivariate-bicycle and genon codes and the five-qubit code, are quotient codes: a larger code folded onto itself by identifying each check with…
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Direct-decision quantum sensing for classifying transient NMR signals
arXiv quant-ph
arXiv:2611.09512v1 Announce Type: new Abstract: Task-oriented quantum sensing aims to extract decision-relevant information directly, without first reconstructing the full signal. We study this approach for mixture-threshold classification…
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Sharp error tolerance of the monogamy-of-entanglement game
arXiv quant-ph
arXiv:2611.09504v1 Announce Type: new Abstract: The BB84 monogamy-of-entanglement (MoE) game has numerous applications in quantum cryptography, including quantum key distribution, position verification, and unclonable encryption. In this…
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Symmetry-Resolved Criticality in Dissipative Quantum Phase Transitions
arXiv quant-ph
arXiv:2611.09450v1 Announce Type: new Abstract: Symmetry breaking in mixed quantum states exhibits a rich strong-to-weak hierarchy, yet the use of symmetry as an operational probe of dissipative criticality remains largely unexplored. In…
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Quantum-induced latent symmetries
arXiv quant-ph
arXiv:2611.09406v1 Announce Type: new Abstract: We study the interplay of latent symmetries and multiparticle quantum states upon the introduction of additional particles. We show how physical symmetries in multimode quantum systems give…
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Enhanced-sensitivity optical sensing of magnetic fields using postselected amplification and continuous-wave power recycling
arXiv quant-ph
arXiv:2611.09379v1 Announce Type: new Abstract: Given the importance of precision weak magnetic field measurement, and noting that postselected amplification has not yet been well applied in this area, in this work we propose to combine…
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Tomography of approximately Gaussian mixed states
arXiv quant-ph
arXiv:2611.09322v1 Announce Type: new Abstract: Moment-based tomography efficiently reconstructs Gaussian states, but stochastic phase noise generally produces mixed, non-Gaussian outputs. For approximately Gaussian outputs, we formulate…
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Critical properties of EPR steering
arXiv quant-ph
arXiv:2611.09321v1 Announce Type: new Abstract: Every PVM-critical entangled two-qubit state becomes steerable with two copies. We prove this for the full critical boundary and for two different critical inputs. The joint measurements can…
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Correlation-Enhanced Quantum Reservoir Processing for Two-Qutrit Steering: From Generalization to Discovery
arXiv quant-ph
arXiv:2611.09268v1 Announce Type: new Abstract: Quantum reservoir processing (QRP) has been applied to entanglement quantification, yet its potential for generalizable steering detection and the discovery of high-dimensional quantum…
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Evaluation of Quantum Machine Learning Models for Network Anomaly Detection
arXiv quant-ph
arXiv:2611.09253v1 Announce Type: new Abstract: The proliferation of Internet-connected devices has intensified the risk of large-scale network intrusions, necessitating more advanced detection methodologies for the post quantum era. This…
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Reachability Constraints and Monotones for Quantum-State Texture
arXiv quant-ph
arXiv:2611.09230v1 Announce Type: new Abstract: How a quantum resource can be quantified depends on which operations are free. Yet two proposed quantifiers of quantum state texture can increase under free operations: the…
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A Tutorial on Practical QKD Post-Processing Algorithms Using a GUI-Based Simulation Framework
arXiv quant-ph
arXiv:2611.09182v1 Announce Type: new Abstract: Recent experimental demonstrations of Quantum Key Distribution (QKD) have attracted significant attention for their ability to establish information-theoretically secure encryption keys for…
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Single-photon scattering by a nanofiber-coupled atomic chain: beyond independent radiation
arXiv quant-ph
arXiv:2611.09164v1 Announce Type: new Abstract: We study single-photon scattering by a nanofiber-coupled atomic chain, comparing a full microscopic model with an independent-radiation approximation. We show that nearly equal transmission…
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Parametric $\mathrm{CZ}$ Gates in a Tunable Tripod Architecture with Fixed-Frequency Superconducting Qubits
arXiv quant-ph
arXiv:2611.09105v1 Announce Type: new Abstract: Efficient implementation of the operations required for quantum error correction in superconducting quantum computers requires high gate fidelity, adequate qubit connectivity, and selective…
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Perfect Wave Transfer in Nonconformal Tomonaga-Luttinger Liquids
arXiv quant-ph
arXiv:2611.09018v1 Announce Type: new Abstract: Perfect wave transfer (PWT) reproduces spatial reflection at a common finite time under a fixed Hamiltonian. We classify this process for open compact bosons and inhomogeneous…
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Optimal asymptotic pure-state conversion under thermal operations
arXiv quant-ph
arXiv:2611.08974v1 Announce Type: new Abstract: Quantum thermodynamics seeks to characterize possible state transformations under thermodynamic constraints in microscopic quantum systems. In the fully quantum regime, however, quantum…
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Local distinguishability of five five-partite orthogonal product states
arXiv quant-ph
arXiv:2611.08940v1 Announce Type: new Abstract: The local distinguishability of five orthogonal product states (OPSs) has been studied in several multipartite settings, but the five-partite case still requires a systematic…
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Optimal Separations Between Randomized and Quantum Query Complexity under Permutation Symmetry
arXiv quant-ph
arXiv:2611.08919v1 Announce Type: new Abstract: A function $f:\cD\subseteq A^N\to\{0,1\}$ is \emph{permutation-invariant} if every permutation of its input positions preserves both its domain and its value. We study how this symmetry…
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Shared Lookups and Lazy Residues: Fewer Toffoli Gates for Factoring RSA-2048
arXiv quant-ph
arXiv:2611.08907v1 Announce Type: new Abstract: Gidney's 2025 construction for factoring RSA-2048 with few logical qubits spends most of its Toffoli gates on discrete-log table lookups and residue uncomputation. We reduce both costs…
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Quantum Fluctuations in Noether's Theorem
arXiv quant-ph
arXiv:2611.08906v1 Announce Type: new Abstract: When deriving the expression for the Noether's current one obtains a term that is an integral over the Euler-Lagrange equation. This term vanishes along the classical path and so does not…
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From spectroscopy to quantum dynamics: assessing reduced models of a NaCs molecular gate
arXiv quant-ph
arXiv:2611.08844v1 Announce Type: new Abstract: We investigate how spectroscopic calibration and basis selection affect predictions for a dipolar-exchange gate between two optically trapped $^{23}$Na$^{133}$Cs molecules. We construct a…
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Kinetic Cluster Embedding for Qubit Decoherence in Dissipative Spin Baths
arXiv quant-ph
arXiv:2611.08830v1 Announce Type: new Abstract: Interpreting the decoherence of a spin qubit requires knowing how the surrounding bath spins behave: whether they fluctuate independently, exchange polarization incoherently, or evolve as…
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Random encoders and expurgation improve 1,873 entries of the Grassl qubit code tables
arXiv quant-ph
arXiv:2611.08744v1 Announce Type: new Abstract: I report 192 explicit binary stabilizer codes $[[n,k,d]]$ with $53\le n\le 254$ and $5\le d\le 13$ whose minimum distance exceeds the lower bound listed in Grassl's code tables at the same…
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Sign-hedged Beam QAOA:Scaling Quantum Optimization Algorithms
arXiv quant-ph
arXiv:2611.08646v1 Announce Type: new Abstract: Quantum Approximate Optimization Algorithm (QAOA) encodes a combinatorial objective as an Ising Hamiltonian and alternates cost and mixer operations for p rounds. Recursive QAOA (RQAOA)…
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What are local complementations, really?
arXiv quant-ph
arXiv:2611.08620v1 Announce Type: new Abstract: A local complementation at a vertex $v$ of a graph $G$ replaces the induced neighborhood of $v$ with its complement. Local complementations are, at face value, peculiar operations. Yet they…
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Harnessing dimensional leakage for continuous-variable randomness certification
arXiv quant-ph
arXiv:2611.08607v1 Announce Type: new Abstract: Semi-device-independent quantum protocols often rely on strict Hilbert-space dimension assumptions that are difficult to satisfy in realistic implementations, particularly with…
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Universality in Quantum Many-Body Spin Ratchets
arXiv quant-ph
arXiv:2611.08590v1 Announce Type: new Abstract: We consider a class of quantum circuits, known as quantum many-body spin ratchets, which act on alternating spin chains with two distinct spin types on even and odd sites. This setup breaks…
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Magic Is in the Eye of the Measure
arXiv quant-ph
arXiv:2611.08586v1 Announce Type: new Abstract: Magic, or nonstabilizerness, is the quantum resource behind universal quantum computation. Its applications in high-energy and nuclear physics rely almost exclusively on the stabilizer…
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Integral zeros of Krawtchouk polynomials and quantum entanglements
arXiv quant-ph
arXiv:2611.08518v1 Announce Type: new Abstract: In Heo and Kiem (2019), the authors raised a problem relating integral zeros of binary Krawtchouk polynomials, parametrized by quadruples $(m,n,k,\ell)$ with $m\le n$ and $k\le \ell$, to the…
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Matrix Samplers and Quantum-Proof Extractors: Their Correspondence and Almost-Optimal Constructions
arXiv quant-ph
arXiv:2610.37122v2 Announce Type: replace-cross Abstract: We establish an equivalence between matrix samplers and quantum-proof randomness extractors. The classical sampler-extractor equivalence is established by a seminal work of…
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Effective skyrmion number for mixed polarization states of light
arXiv quant-ph
arXiv:2605.24293v2 Announce Type: replace-cross Abstract: Polarization skyrmions are usually characterized through a unit Stokes vector field, which defines a map from the transverse plane to the Poincar\'e (Bloch) sphere and allows one to…
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Multimode squeezed light generation and characterization
arXiv quant-ph
arXiv:2609.08591v2 Announce Type: replace Abstract: Nowadays, the realization of quantum computations and communications based on continuous variables has attracted significant attention due to a substantial expansion of the system…
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Transferred QAOA Parameters Remember the Penalty Scale: A $\lambda$-Resonance Law for Constrained Quantum Optimization
arXiv quant-ph
arXiv:2607.09927v2 Announce Type: replace Abstract: Training the variational angles of the Quantum Approximate Optimization Algorithm once on a small instance and reusing them on larger ones, known as parameter transfer, is the standard…
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Controlling Waiting Time Statistics in Monitored Collective Spins: Mitigating Detector's Resolution Barrier in Measurement-Induced Phase Transitions
arXiv quant-ph
arXiv:2607.01332v3 Announce Type: replace Abstract: In collective dissipative spin systems, the postselection barrier can be partially mitigated; however, a further obstacle may be posed by the finite temporal resolution of detectors. In…
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Imperceptible measurement deviations can fake high-dimensional entanglement
arXiv quant-ph
arXiv:2606.20396v2 Announce Type: replace Abstract: Quantum entanglement is a central resource for emerging quantum technologies, but its experimental certification usually assumes that prescribed quantum measurements can be realized…
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Complementary quantum and classical records of qubit decoherence
arXiv quant-ph
arXiv:2605.15882v3 Announce Type: replace Abstract: Decoherence is usually viewed as the loss of local coherence, but it also writes information into the environment. Here we examine two complementary forms of this information. One is a…
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Multi-Objective Optimization with Quantum-Annealing-Inspired Algorithms
arXiv quant-ph
arXiv:2604.26477v4 Announce Type: replace Abstract: Combinatorial optimization is widely regarded as a primary application for near-term quantum processors, although a definitive demonstration of a practical quantum advantage remains…
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Operational bounds and diagnostics for coherence in energy transfer
arXiv quant-ph
arXiv:2603.09748v2 Announce Type: replace Abstract: Excitation energy transfer in light-harvesting aggregates is highly efficient, yet whether quantum coherence plays an operational role in transport remains debated. A central challenge is…
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Semi-device-independent channel identification with communication matrices
arXiv quant-ph
arXiv:2511.14273v2 Announce Type: replace Abstract: We look into the task of differentiating between any two quantum channels and reconstructing them from the obtained measurement statistics with possibly limited information about the…
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Orbit dimensions in linear and Gaussian quantum optics
arXiv quant-ph
arXiv:2506.07995v5 Announce Type: replace Abstract: We study the dimension of the manifold of quantum states (called orbit) that a given bosonic state can reach under linear or quadratic Hamiltonian evolutions. That is, we investigate how…
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Deterministic interconversion of the Greenberger-Horne-Zeilinger state and Knill-Laflamme-Milburn state via Lie-transform-based pulse design in Rydberg atoms
arXiv quant-ph
arXiv:2405.15456v2 Announce Type: replace Abstract: Conversion between different types of entangled states is an interesting problem in quantum mechanics. But research on the conversion between Greenberger-Horne-Zeilinger (GHZ) state and…
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Trajectory-Dependent Decoherence and Leakage During Shuttling of Multi-Spin Qubits
arXiv quant-ph
arXiv:2611.09873v1 Announce Type: cross Abstract: Logical qubits encoded in collective states of multiple spins are promising building blocks for large-scale semiconductor quantum processors. As novel fault-tolerant architectures…
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Classical control of quantum-state relaxation in confined molecular hydrogen
arXiv quant-ph
arXiv:2611.09850v1 Announce Type: cross Abstract: Quantum-state conversion between the ortho and para nuclear-spin states of H$_2$ is forbidden in the isolated molecule but these states can become connected through interactions with a…
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Scanning Probe Control, Quantum Dynamics, and Dispersive Readout of Suspended Carbon Nanotube Resonators
arXiv quant-ph
arXiv:2611.09581v1 Announce Type: cross Abstract: Suspended carbon nanotubes (CNTs) offer promising opportunities for quantum nanomechanics owing to their small effective mass, strong electrostatic tunability, and mechanical nonlinearity…
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Reconstructing intracell polarization with calibrated sapphire-window optics for collimated blue-light generation in a rubidium cell
arXiv quant-ph
arXiv:2611.09441v1 Announce Type: cross Abstract: We study the polarization dependence of collimated blue light (CBL) generated near 420~nm by resonant four-wave mixing in thermal rubidium vapor in a sapphire-window cell driven at 780 and…
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$\mathbb{Z}_2$ gauge and exact solution of the $\pm J$ Edwards-Anderson model in a transverse field
arXiv quant-ph
arXiv:2611.09097v1 Announce Type: cross Abstract: Using the Majorana representation of spin-1/2 operators, we study the $\pm J$ Edwards--Anderson model in a transverse field at $T=0$. We show that, in this representation, the quantity…
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Hybrid Quantum-Classical Annealing for Protein Side-Chain Optimization: A Feasibility Study
arXiv quant-ph
arXiv:2611.08696v1 Announce Type: cross Abstract: Hybrid quantum-classical annealing solvers are moving from research laboratories toward industrial use, but their advantage over classical optimization appears to be confined to a narrow…
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Gibbsian Entropy for General Wigner Distributions
arXiv quant-ph
arXiv:2611.09839v1 Announce Type: new Abstract: We propose a definition of non-equilibrium Gibbsian entropy applicable to general quantum systems, computable from Wigner functions, for both Gaussian and non-Gaussian states. We show that…
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Universal photonic synthetic temporal-mode converter for heterogeneous quantum interconnects
arXiv quant-ph
arXiv:2611.09752v1 Announce Type: new Abstract: We propose a synthetic temporal-mode converter (STC) that combines programmable waveform matching with denser time multiplexing for heterogeneous quantum interconnects. Programmable couplers…
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A Phase-Balanced Differential Rydberg-Atom Quantum Receiver for Weak GNSS Signal Detection
arXiv quant-ph
arXiv:2611.09653v1 Announce Type: new Abstract: This paper proposes a phase-balanced differential Rydberg atomic quantum receiver (DRAQR) for weak-signal recovery, using local-oscillator phase control to reinforce differential signal…
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Modular Hamiltonian and Typicality of Degenerate States
arXiv quant-ph
arXiv:2611.09595v1 Announce Type: new Abstract: Free fermions exhibit Eigenstate Typicality (ET) meaning that the reduced density matrix, $\rho$, of a small spatial subsystem of a {\sl single}, typical, excited energy eigenstate is…
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Magic Can Superactivate Quantum Capacity
arXiv quant-ph
arXiv:2611.09594v1 Announce Type: new Abstract: Environmental magic can enable two channels with zero quantum capacity to transmit quantum information jointly. We establish this superactivation within a family of discrete quantum…
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Resonance-engineered single-photon routing in an asymmetric Jaynes-Cummings cavity-waveguide system
arXiv quant-ph
arXiv:2611.09519v1 Announce Type: new Abstract: We investigate single-photon scattering and routing in an asymmetric cavity-waveguide quantum electrodynamics system consisting of a Jaynes-Cummings cavity-emitter subsystem coupled to two…
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Dynamics and pseudospectra around quantum exceptional points
arXiv quant-ph
arXiv:2611.09464v1 Announce Type: new Abstract: Exceptional points (EPs) are a hallmark of non-Hermitian physics, giving rise to extreme sensitivity and enhanced dynamic response. Such unique spectral singularities have been extensively…
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Optimal performance of driven-dissipative many-body quantum batteries beyond complete nonreciprocity
arXiv quant-ph
arXiv:2611.09434v1 Announce Type: new Abstract: Proposals for nonreciprocal quantum batteries identify the point of complete nonreciprocity, where coherent and reservoir-mediated couplings balance, as the operating point for enhanced…
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Flexible Control of Temporal Reflection and Refraction via Joint Parameter Modulation
arXiv quant-ph
arXiv:2611.09405v1 Announce Type: new Abstract: Achieving the flexible control of wave propagation is a central goal in the design of optical devices. In this work, our analytical results and numerical simulations show that in both the…
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A Geometric Journey Through the Aharonov--Bohm Effect: Tonomura's Toroid, Pseudoscalar Phase, and Quantum Holonomy in Clifford Algebra
arXiv quant-ph
arXiv:2611.09311v1 Announce Type: new Abstract: The magnetic Aharonov--Bohm (AB) effect is often introduced through the idealised infinite solenoid and a complex scalar phase. We give a geometric-algebra formulation based on the compact…
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Exploring Variational Regularization of Krylov Subspaces
arXiv quant-ph
arXiv:2611.09229v1 Announce Type: new Abstract: Krylov subspace methods efficiently approximate extremal eigenstates and eigenvalues of many-body Hamiltonians, but non-orthogonal bases can suffer from ill-conditioning. This challenge is…
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Time evolution in the multi-component dynamical Keldysh models
arXiv quant-ph
arXiv:2610.38338v2 Announce Type: replace-cross Abstract: We construct a time evolution operator for a dynamical quantum models with a multi-component random Gaussian field characterized by a long correlation time. We analyze three…
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Quantum-Enhanced Classical Communications for DPMZM-based NG-PON2 Systems
arXiv quant-ph
arXiv:2611.09081v1 Announce Type: new Abstract: This paper presents a framework for integrating quantum detection techniques into a Dual-Parallel Mach-Zehnder Modulator (DPMZM)-based Next Generation Passive Optical Network 2 (NG-PON2)…
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Time- and phase-resolved emulation of sign-selective counterdiabatic dynamics in a superconducting qutrit
arXiv quant-ph
arXiv:2611.08913v1 Announce Type: new Abstract: In cyclic three-level systems, phase-sensitive interference can convert a coupling-sign reversal into a population contrast, providing a controllable analogue of handedness. We emulate this…
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Neutral-atom quantum features as complementary structural encodings for graph learning
arXiv quant-ph
arXiv:2611.08821v1 Announce Type: new Abstract: Structural descriptors provide graph neural networks (GNNs) with positional and topological inductive biases. However, widely used classical encodings based on random walks or Laplacian…
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How Many Shots Does a Quantum Reservoir Need? Measurement Cost and Its Scaling in Buffered Quantum Reservoir Computing
arXiv quant-ph
arXiv:2611.08632v1 Announce Type: new Abstract: Quantum reservoir computing (QRC) inherits from classical reservoir computing the property that only a linear readout is trained, but unlike a classical reservoir its state is never directly…
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Quantum-enabled measurement of gravitational forces at the milligram scale
arXiv quant-ph
arXiv:2611.08619v1 Announce Type: new Abstract: Gravity is by far the weakest among all known interactions. While it dominates the large-scale structure of the universe, gravitational interactions between small masses in the microscopic…
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Exploring topological signatures of quantum Fisher information scaling in graph states
arXiv quant-ph
arXiv:2611.08593v1 Announce Type: new Abstract: Graph states are a versatile resource for quantum metrology, and their quantum Fisher information (QFI) has a closed-form expression in terms of the underlying graph: it counts pairs of…
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Thermodynamics of Speed and Efficiency with Quantum Feedback
arXiv quant-ph
arXiv:2611.08564v1 Announce Type: new Abstract: Rapid thermodynamic operations generally entail irreversible dissipation, giving rise to trade-offs between operating speed and thermodynamic cost. Yet, how quantum feedback fundamentally…
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Interaction-enabled charging and thermal crossover of the spin-work deficit in a Hubbard double quantum dot
arXiv quant-ph
arXiv:2611.09119v1 Announce Type: new Abstract: We study how conservation of total spin affects the extractable work of an interacting Hubbard double quantum dot charged in the presence of unresolved quasistatic detuning fluctuations. The…
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Schr\"{o}dinger Generator for High-Dimensional Integration and Sampling on Quantum Many-Body States
arXiv quant-ph
arXiv:2608.00529v2 Announce Type: replace-cross Abstract: Integration and sampling in high dimensions are among central challenges in modern science and technology, underlying applications ranging from quantum many-body physics to Bayesian…
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A complete classification of perfect state transfer in Grover walks on Cayley graphs over dihedral groups
arXiv quant-ph
arXiv:2605.02254v2 Announce Type: replace-cross Abstract: We give a complete classification of Cayley graphs over dihedral groups that exhibit perfect state transfer between distinct vertex states in Grover walks. For $n\ge 3$, let…
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Correlated decoding loses the surface code's effective distance below threshold
arXiv quant-ph
arXiv:2610.26785v2 Announce Type: replace Abstract: Correlated decoding improves matching and clustering surface-code decoders by reweighting one decoding subgraph conditioned on the other's correction. We show that standard reweighting…
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A Kernel-Based Density of States Estimator for Quantum Computing
arXiv quant-ph
arXiv:2607.24972v2 Announce Type: replace Abstract: We introduce a quantum kernel method for estimating the density of states (DoS) of quantum many-body systems. The method exploits the Rodeo algorithm as a physical implementation…
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Depth-reduced quantum simulation of Lindbladian dynamics via adaptive variational quantum trajectory compression
arXiv quant-ph
arXiv:2607.09051v2 Announce Type: replace Abstract: Quantum simulation of open quantum systems in the noisy intermediate-scale quantum (NISQ) era is hindered by the non-unitary nature of dissipative dynamics and the limited quantum…
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On the generic structures of the protocols for quantum auction and quantum summation and their relation
arXiv quant-ph
arXiv:2606.27693v3 Announce Type: replace Abstract: Secure multi-party computation (SMC) addresses the problem of jointly computing global functions of private inputs while revealing minimal information about individual data. Two prominent…
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Coupling-Grouped XY-QAOA for Joint Anomaly-Feature Selection
arXiv quant-ph
arXiv:2606.13244v3 Announce Type: replace Abstract: Selecting anomalous samples and explanatory features under fixed cardinalities defines a coupled optimization problem: feature-first selection can overlook features whose usefulness…